71948 CD/HCP4ADBA
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71948 CD/HCP4ADBA
Basic Information
System of measurement
Metric
Weight
12 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
240 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
320 mm
Outside diameter tolerance
-0.004mm to 0
Width
76 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
25.4 mm
Ball quantity
31
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
83475 lbf
Radial static load rating
144000 lbf
Limiting speed
7.5 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Duplex Back-to-Back (DB)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
Preload
Extra light / Class A
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
In Stock
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71948 CD/HCP4ADBA Bearing Product Overview & Core Advantages
The 71948 CD/HCP4ADBA is a precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and performance. This duplex back-to-back (DB) matched set is manufactured to a P4A tolerance class, ensuring ultra-precise rotational running accuracy. Its primary advantage lies in its ability to handle combined loads (radial and axial) simultaneously, providing high system rigidity and stability. The use of ceramic balls and a phenolic cage contributes to superior high-speed performance and reduced operational friction, making it ideal for high-precision, high-rigidity spindle applications.
71948 CD/HCP4ADBA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71948 | Basic bearing series and size designation (Bore: 240 mm, OD: 320 mm, Width: 76 mm). |
| CD | Indicates a duplex back-to-back (DB) arrangement. This configuration provides high moment stiffness. |
| HC | Signifies the use of Hybrid Ceramic components (ceramic balls with steel rings). |
| P4A | Denotes an ultra-precision tolerance class superior to ABEC 7, ensuring minimal runout and vibration. |
| DB | Reinforces the Duplex Back-to-Back matched set configuration. |
| A | Specifies the contact angle of 15°, optimized for carrying axial loads. |
71948 CD/HCP4ADBA Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The duplex back-to-back (DB) arrangement creates a wide, rigid support system that effectively resists moment loads, making it exceptionally stable under complex loading conditions.
- Superior High-Speed Capability: The combination of ceramic balls (lower density, reduced centrifugal force) and a lightweight phenolic cage significantly lowers friction and allows for a high limiting speed of 7,500 rpm.
- Enhanced Load Capacity: With a 15° contact angle and a dynamic load rating of 83,475 lbf, this bearing is engineered to handle significant combined radial and axial loads.
- Precision Engineering: Manufactured to P4A tolerance class with tight dimensional tolerances on the bore, outside diameter, and width, this bearing guarantees precise shaft positioning and smooth, quiet operation.
- Pre-Lubricated: The bearing comes lubricated from the factory, ready for immediate installation and initial operation.
71948 CD/HCP4ADBA Bearing Typical Application Areas
This bearing is specifically designed for high-performance machinery where precision, speed, and rigidity are paramount. Key applications include:
- High-Frequency Machine Tool Spindles (e.g., for milling, grinding, and drilling)
- Precision Grinding Spindles
- High-Speed Machining Centers
- Advanced Robotic Drives
- Other precision equipment requiring matched bearing sets for optimal performance.
